The effect of focusing on polarization qubits

Netanel H. Lindner, Daniel R. Terno*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


When a photon with well-defined polarization and momentum passes through a focusing device, these properties are no longer well defined. Their loss is captured by describing polarization by a 3 x 3 effective density matrix. Here we show that the effective density matrix corresponds to the actual photodetection model and we provide a simple formula to calculate it in terms of classical fields. Moreover, we explore several possible experimental consequences of the 'longitudinal' term: limits on single-photon detection efficiency, polarization-dependent atomic transitions rates and the implications on quantum information processing.

Original languageEnglish
Pages (from-to)1177-1188
Number of pages12
JournalJournal of Modern Optics
Issue number8
Publication statusPublished - 20 May 2005
Externally publishedYes


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